Nut-wrench



(No Model.)

T. G. LIPPITT.

. NUT WRENCH.

Patented Oct.

f/zwaare Fm TTY.

" ITED STATES PATENT OFFICE.

THEODORE O. LIPPITT, OF SHENANDOAH, IOWA.

NUT-WRENCH.

SPECIFICATION forming part of Letters Patent No. 507,587, dated October 31, 1893.

Application filed March 9, 1893. Serial No. 465,312- (No model.)

To all whom it may concern:

Be itknown that I, THEODORE O. Lrrrrrna citizen of the United States, residing at Shenandoah, in the county of Page and State of Iowa, have invented certain new and useful Improvements in Nut-Wrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to that class of screw wrenches having one fixed and one swinging jaw, and the object is to provide means for giving the swinging jaw a motion always parallel to the fixed jaw, means for bracing the swinging jaw to obtain a firm grip therewith, and means for adjusting the brace with a screw whereby the jaw may be set to any degree of opening.

To this end my invention consists in the construction and combination of parts forming a screw wrench, hereinafter described and claimed, reference being had to the accompanying drawings, in which- Figure I, represents my invention in side elevation. Fig. II, isa face View of the same, certain parts being broken away. Fig. III, shows a modification of the links. Fig. IV, is a perspective view of removable jaws.

5 indicates the wrench body or bar which is bent to one side to form a fixed head 6.

7 is the movable jaw hung to swing upon the fixed jaw by means of parallel links 8, which are pivoted at their ends respectively to the bar and to the swinging jaw.

9 indicates the handle, either made integral with the bar 5 or secured firmly thereto.

10 is a screw fitted to slide freely in the handle, and 11 is a screw nut threaded upon the screw and located between end bearings 12 in the handle.

13 is a hasp passing around three sides of the bar and rigidly secured to the head 14 of the screw by means of a rivet or screw 15, the hasp and screw-head forming a carriage to slide upon the bar 5.

16 is a brace pivoted at one end to the screw-head and at the other end to the swinging jaw.

In operation the nut 11 being turned one way, pushes out the screw, advances the carriage, and the brace 16 being advanced therewith pushes upon the swingingjaw 7 to close it toward or upon the fixed jaw 6; and turning the nut 11 the other way reverses the operation and opens the jaws.

Itis evident that the head 14. might be made in a separate piece from the screw and be otherwise joined with the hasp 13 to form thesliding carriage, or the carriage might be formed of a single piece and the screw be rigidly fixed thereto.

In Fig. I, I have shown the links and brace as entering slots in the swinging jaw, the bar and the carriage, but in some respects I prefer to make them with projecting trunnions 17 at their inner sides to pass through each, the jaw, the carriage and the bar, and be firmly secured together by binding screws 18. This is perhaps more expensive than the central bars and braces, and a little heavier, but it is also stronger, as the bearing is directly upon the trunnions and not upon the pivot pins. It is evident that the brace 16 presses the screw-head down upon the bar in service so that the hasp 13 might be dispensed with, though I prefer to use it.

20 represents a toothed pipe jaw fitted to engage the face of either of the wrench jaws 6 or 7 and provided with a stud 21 adapted to pass through wrench jaw to keep the toothed jaw in place. On pulling upon the toothed jaw its stud may be removed from the wrench jaw leaving the wrench adapted for the common purposes of a nut-wrench. These toothed jaws are socket-shaped at the back to surround and neatly fit upon the advance edges of the wrench jaws in order that the tendency of the toothed jaws to slide upon the wrench jaws while in service may be resisted by said socket bearings instead of being supported wholly by means of the studs.

Having thus fully described my invention, what Ibelieve to be new, and desire to secure by Letters Patent, is the following:

1. The combination in a screw wrench, of a bar with an oifset head at one end andahandle at the other; aloose jaw parallel with the head; a pair of parallel links pivoted at their ends respectively to the bar and the loose jaw; ascrew fitted to slide freely in the handle; a nut threaded upon the screw and 10- ICO cated to revolve between end bearings in the handle; a carriage fitted to slide upon the bar and rigidly connected with the screw, and a brace pivoted to and connecting the carriage with the loose jaw, substantially as described.

2. The combination in a screw wrench, of a bar having a head at one end; a pair of links pivoted to the bar; a jaw pivotally mounted on the free ends of the said links; a carriage fitted to slide upon the bar; a brace pivoted at one end to the carriage and at the other end to the loose jaw and means for sliding, the carriage, substantially as described.

3. The combination in a screw Wrench, of a bar having a head at one end; a pair of links pivoted to the bar; a jaw pivotally mounted on the free ends of the links; a carriage fitted to slide upon the bar; abraoe pivoted at one end to the carriage and at the other end to the loose jaw; a screw made fast to the car-' riage and fitted to slide in the handle, and a nut mounted upon the screw between end bearings of the handle, substantially as described.

4. The combination of a wrench bar having a fixed jaw; a movable jaw; links having integral trunnions on their sides to pass through the loosejaw and through the wrench bar, and means for swinging the loose jaw upon its links, substantially as described.

5. The combination in a wrench of a pair of nut-wrench-jaws each perforated through, and a toothed pipe-jaw made socket-shaped to fit upon and around the edge of each wrench jaw and provided each with a fixed stud to engage the perforation in the wrench jaw, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

THEODORE C. LIPPITT.

\rVitnesses:

CHRISTOPHER LIPPITT, WALTER WILSON. 

